-- @testpoint: opengauss关键字exists(非保留)，作为函数名，部分测试点合理报错

--关键字不带引号-失败
drop function if exists exists;
create function exists(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带双引号-成功
drop function if exists "exists";
create function "exists"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists "exists";
--关键字带单引号-合理报错
drop function if exists 'exists';
create function 'exists'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `exists`;
create function `exists`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/